Pattern 1 is a simple down-up pattern. Most of the movement will come from your wrist, but don't be afraid to swing your arm slightly at the elbow. Alternate down and up smoothly. Try to get the same volume on the upstroke as on the downstroke. Repeat the pattern in a loop to keep the rhythm going. Count it 1 and 2 and 3 and 4 and 1 and...
Pattern 2 is slightly more difficult. Don't play the strings on the 3-downstroke, but keep your arm and wrist movement the same as in pattern 1.